<!DOCTYPE html>
<html>

  <head>
    <meta charset="utf-8">
    <meta name="viewport"
          content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no">
    <title>EPUB</title>
    <script src="https://cdn.bootcdn.net/ajax/libs/jszip/3.1.5/jszip.min.js"></script>
    <script src="https://fastly.jsdelivr.net/npm/epubjs@0.3.88/dist/epub.min.js"></script>
    <script>
      document.addEventListener('DOMContentLoaded', () => {
        const html = document.querySelector('html')
        let fontSize = window.innerWidth / 10
        fontSize = fontSize > 50 ? 50 : fontSize
        html.style.fontSize = fontSize + 'px'
      })
    </script>
    <style>
      * {
          padding: 0;
          margin: 0;
      }

      .mask {
          position: absolute;
          display: flex;
          left: 0;
          width: 100%;
          height: 100%;
          flex-direction: column;
      }

      .meun {
          display: flex;
          height: 1rem;
          align-items: center;
      }

      #toc {
          flex: 1;
          z-index: 100;
          font-size: .3rem;
          padding-left: .4rem;
          color: #333;
      }

      #page {
          z-index: 100;
          font-size: .3rem;
          color: #333;
          padding-right: 0.4rem;
          text-align: right;
          flex: 0 0 .5rem;
      }

      #load {
          z-index: 100;
          font-size: .3rem;
          color: #333;
          padding-right: 0.4rem;
          text-align: right;
          flex: 0 0 .5rem;
      }

      #toc-content {
          position: absolute;
          display: flex;
          top: 0;
          right: 0;
          z-index: 102;
          min-width: auto;
          max-width: 80%;
          height: 100%;
          background: white;
          flex-direction: column
      }

      #toc-mask {
          position: absolute;
          top: 0;
          left: 0;
          z-index: 101;
          width: 100%;
          height: 100%;
          background: rgba(51, 51, 51, .8);
      }

      .intro {
          width: 100%;
          height: 2.4rem;
          padding: .2rem .4rem;
          box-sizing: border-box;
          height: 3rem;
          display: flex;
          border-bottom: .1rem solid #f4f4f4;
      }

      .txt {
          display: flex;
          flex: 1;
          align-items: center;
          padding: 0 .2rem;
          font-size: .3rem;
      }

      #content {
          overflow-y: auto;
      }

      .item {
          padding: .2rem .4rem;
          border-bottom: .07rem solid #f4f4f4;
          font-size: .4rem;
          color: #333;
      }

      #open {
          display: flex;
          flex: 1;
          z-index: 100;
          font-size: .4rem;
          color: #333;
          align-items: flex-end;
          justify-content: center;

      }

      #open span {
          padding: .3rem .3rem;
          border: .05rem solid #333;
          border-radius: .2rem;
      }

      .read {
          display: flex;
          flex: 1 1 auto;
      }

      #prev {
          flex: 0 0 2rem;
          z-index: 100;
      }

      #viewer {
          flex: 1;
      }

      #next {
          flex: 0 0 2rem;
          z-index: 100;
      }

      .save {
          display: flex;
      }

      .box {
          padding: .2rem .2rem;
          justify-content: center;
          border-bottom: .1rem solid #f4f4f4;
      }

      .jump {
          display: flex;
          height: 1rem;
          border-bottom: .1rem solid #f4f4f4;
      }

      .jump input {
          flex: 1;
          padding: .1rem .1rem;
          margin: .2rem .2rem .2rem .4rem;
          outline: none;
          font-size: .3rem;
      }
      
      .jump span {
          flex: 0 0 1rem;
      }
    </style>
  </head>

  <body>
    <div id="ebook">
      <div class="mask">
        <div id="open">
          <span
            onclick="document.getElementById('input').click();document.getElementById('open').style.display = 'none'">选择本地书籍</span>
          <input type="file" id="input" style="display: none;">
        </div>
        <div class="read">
          <div id="prev" onclick="rendition.prev()"></div>
          <div id="viewer"></div>
          <div id="next" onclick="rendition.next()"></div>
        </div>
        <div class="meun">
          <div id="toc" onclick="showhide()"></div>
          <div id="page"></div>
          <div id="load"></div>
        </div>
        <div id="toc-mask" style="display: none;" onclick="showhide()"></div>
        <div id="toc-content" style="display: none;">
          <div class="intro">
            <img id="cover">
            <div style="display: flex;flex: 1;flex-direction: column;overflow-y: auto;">
              <div id="title" class="txt"></div>
              <div id="author" class="txt"></div>
              <div id="publisher" class="txt"></div>
              <div id="pubdate" class="txt"></div>
            </div>
          </div>
          <div class="save">
            <div class="txt box" onclick="save()">存档</div>
            <div class="txt box" onclick="get()">读档</div>
            <div class="txt box" onclick="del()">删档</div>
          </div>
          <div class="jump">
            <input id="jump" type="number" placeholder="0-1之间的数字，如0.25"
                   oninput="if(value>1)value=1;if(value<0)value=0">
            <span class="txt" onclick="jump()">跳转</span>
          </div>
          <div id="content"></div>
        </div>
      </div>
    </div>
    <script>
      let url = location.search.substring(3);
      if (url !== "") {
        var book = ePub(url);
        document.getElementById("open").style.display = "none"
      } else {
        var book = ePub();
        var inputElement = document.getElementById("input");
        inputElement.addEventListener('change', function (e) {
          var file = e.target.files[0];
          if (window.FileReader) {
            var reader = new FileReader();
            reader.onload = openBook;
            reader.readAsArrayBuffer(file);
          }
        });
        function openBook(e) {
          var bookData = e.target.result;
          book.open(bookData, "binary");
        }
      }
      //渲染
      var rendition = book.renderTo("ebook", {
        with: window.innerWidth,
        height: window.innerHeight - 20
      });
      rendition.display();

      book.ready
  .then(() => {
    var local = localStorage.getItem(book.key() + '-locations');
    if (local) {
      return book.locations.load(local);
    } else {
      return book.locations.generate();
    }
  })
  .then(locations => {
    localStorage.setItem(book.key() + '-locations', book.locations.save());
  })

      // 目录
      book.loaded.navigation.then(toc => {
        var read = localStorage.getItem(book.key() + '-read');
        if (read) {
          rendition.display(read);
        }
        var $content = document.getElementById("content");
        toc.forEach(item => {
          var div = document.createElement("div");
          div.className = "item";
          div.textContent = item.label;
          div.addEventListener("click", () => {
            rendition.display(item.href);
            showhide()
          });
          $content.appendChild(div)
        })
      })
      //简介
      book.loaded.metadata.then(meta => {
        var $title = document.getElementById("title");
        var $author = document.getElementById("author");
        var $cover = document.getElementById("cover");
        var $publisher = document.getElementById("publisher");
        var $pubdate = document.getElementById("pubdate");
        $title.textContent = `书名：${meta.title}`;
        $author.textContent = `作者：${meta.creator}`;
        $publisher.textContent = `出版社：${meta.publisher}`;
        $pubdate.textContent = `时间：${meta.pubdate}`;
        if (book.archive) {
          book.archive.createUrl(book.cover)
            .then(url => {
              $cover.src = url;
            })
        } else {
          $cover.src = book.cover;
        }
      });
      //进度显示
      rendition.on('relocated', location => {
        var percent = book.locations.percentageFromCfi(location.start.cfi);
        var $page = document.getElementById("page");
        var $load = document.getElementById("load");
        $page.textContent = location.end.displayed.page + '/' + location.end.displayed.total;
        $load.textContent = Math.fround(percent * 100).toFixed(1) + '%';
      })
      //章节名显示
      rendition.on("rendered", section => {
        var $toc = document.getElementById("toc");
        $toc.textContent = "目录";
        $toc.textContent = book.navigation.get(section.href).label;
      })
      function showhide() {
        var $toc_content = document.getElementById("toc-content")
        var $mask = document.getElementById("toc-mask")
        if ($toc_content.style.display == "none") {
          $toc_content.style.display = ""
          $mask.style.display = ""
        } else {
          $toc_content.style.display = "none"
          $mask.style.display = "none"
        }
      }
      function jump() {
        $jump = document.getElementById("jump").value;
        rendition.display(book.locations.cfiFromPercentage($jump));
        showhide();
        document.getElementById("jump").value = "";
      }
      function save() {
        localStorage.setItem(book.key() + '-read', rendition.currentLocation().start.cfi)
        showhide()
      }
      function get() {
        rendition.display(localStorage.getItem(book.key() + '-read'));
        showhide()
      }
      function del() {
        localStorage.removeItem(book.key() + '-read');
        showhide()
      }
    </script>
  </body>

</html>
